Contact-arm for voltage-regulators.



.I. D. NIES.

CONTACT ARM FOR VOLTAGE REGULAIORS.

APrucmou FILED SEPT- lo. |au.-

17,. x I my! 1,285,786. Patented Nov. 26, 1918.

omrrnnsmnrns PATENT @FFIQE JOHN D; ms,

or T. CHARLES, I' LI voIs, Ass IoNfoR' roK 'ntnLn cesium,

or CHICAGO, ILLINOIS, A CORPORATION 0Fv ILLINOIS.

CONTACT-ABM son vomnon niiemroits'i.

Specification of Letters Fatefit.

PatentedNo'v. 26; 1918;

Application filed September 10; 1917. Serial No.190g487.

To allwhom it may concern: I

Be'it known that'I, JOHN D. NIES, a citizen of'the.United'States' residing at St. Charles, in the county of Kane and State of Illinois; have invented certain new and useful Improvements in Contact-Arm's for voitage=Regulatorsy of which the following is'a'spec'ification; 4 In connectionwith the-user of a direct current, a" rheostat may be e'mployedin whieh -the 'contact arm may'momentari'lyor f'everi permanently rest incontact'with two "adiacent-pbints witho'ut' injiii'y; but with an alternating urrent in connec'tion'r'iwitha trmisfocmerii if the" contact carried' by; the crumbs all'owed torest' evemmomentai'ily in contact with two adj sicentnpoints; therl :will "lieiirsho rhcircuiting'o'f the particular trans- \I formerf'wiiidingi'with-resuitamt burningout of the sam'ei A I ":ltrhns beenrproposed to alternate the live transformer" points'- w'it]i1 interposed dead pointsssor as to prevent any short c-ircuiting by reiisorrofrthe-z-oontact ,arm bridging two litre points. f .This arrangement isnot. only more expensive: to? build-but it is cumbersofiiein that itirequ-ires a dial of twice the siz'm-byvreason of .themterposed dead points.

-:.:2 1. ;:'=It -has'%also'beemproposed to usea segmerit platewhavingvconcave cjam surfaces -or r'scallopsflwithin the-arcofthe. dial and on mdialelinesconnecting-the. points and the pivot-ofnthe' contact arm Therein: a pin 1 1 I carried by-the contact member on-the arm,

1riding .upon these cam surfaces, serves to retract the:contact'-.as its passes from one to another point on the dial so as toprevent-its bridging any-twoof: them., This isn very: expensive proposition to build as this segmenvplate must-be of hard steel and the smile) s-formed -byi-filing-i Moreover they.

:-znuste exactlylocat edl and .theplatemusfi "be-accurately fitted upon the panel in. orderi that-thecontactshall-bearequally upon. eachL} of-ethevdi-al points-in turn.

a: The present invention contemplates'the employment ofthe arcuateseries of contact ;-p oi-nts themselves inpIace otthe scalloped segment late previously referred to, and

the move le contact member. of the. arm is mounted upon a cross head providedi with rollers of insulating material which roll into andi outpfi the spacesbetween the points, causing the contact member to advanceginto'g,

andTretract out of contact with the intermediate point of the dial.

In orderthat the invention ma be re'adil understood 5 preferred and inodi ed embodv ments of the same are set forth inthe accompanying drawings-and-in the following detailed description based "thereon. Obviously the invention may: be embodied in otherzconstructional forms; whereiorethe description and claim'srare tor'be-tak-en in -.an= illustrative rather. than; in: an unnecessarily limiting sense. In the drawin'gs-- Figure-21 v is an-elevation. of, a voltage. regulator embodying'the invention-p; 4

Fig.- 2 is a vertical sectionon therline22 ofE1g:-1; I :7

Fig.3 3 is a=.fragliientary"elevation of a modification; and 3 l Fig: 4 is a-schematieviewillustrating-the ap licatioiiofthe invention,

erein 1 an alternating-current motor is indicated at 11, 1 the field; eta-12, the; main leads-M13, 14; the transformer at 15',land the transformer 'points formin 17 '26. The contact-arm ZT pIVoted at-28 which pivot is electrically connected means of a wire 29 with the brush; 30 has movabiymounted thereonva contact member gthe dialat 1 31 electrically;connected;witkthe pivot 28 and arranged to traverse the dial formed by the stem 32 slidin contact member being pressed; outwardly, by

means of the compression spring 34 bea rin with: its? two. endsngainst the insulate plates 35 and 36 whereby the said spring is protected from-.theielectriccurrent which pessesa from the. contacttmemben to the 'hub of thecontact arm. througlrthewire 3,7; A

retractionofzthe In. .order. to.- ca-us o'uthe contactarm soas totc ear thepoint comprising the dial: whembeing nioyed, from, one point; to another;- the. contact. member has rigidlyfixedetheron' a crosshead38 having mounted .in its twdektreinitie's the rollerst39 and. 40 of insulating material. y W

It will-be evident t'hatwhen the rollers 39-40 occupy thenpositions lshown in 1 F ig, 1, intermediate the points 19 and 20 an {the ppintsh22+23 respectively, the-inoseeo the i contact member 31 will rest upon the intermediate point 21. When, however, the contact arm is moved u on its pivot 28 to the ri ht, as shown in Fig. 1, the roller 39 will ri e u on the contact point 20 and the roller 40 wil ride upon the point 23, asindicated in dotted lines in said figure thus retracting the contact member31 to such an extent that it will not bridge the space between the points 21, 22, but will clear the same, and as soon as the rollers 39, 40 drop into the interspaces separating the points 20, 21 and 23, 24: respectively the contact member 31 will be permitted to advance under the reaction of the spring 34 bringing its nose into contact with the point 22.

By formin the cross head 38 rigid with reference to t e reciprocating contact member 31, the arm may be thrown to the extreme at'eitherend of the dial, depending upon one of the rollers 39 or 40 alone to hold it out of contact even though the other roller be beyond the dial; i I

'kHaving reference to Fig. 3 of'the draw ing, the construction is the same with the exception that the cross head 41 has one arm 42 and to its extremity at 13 is pivoteda lever arm 4% which is likewise pivoted tofthe contact member 31 at 45, and 'carr-iesat its free end a singleroller 46. The operation in this form of construction recisely" the same as that previously jdescrihed ;with the exception that there would preferably be provided at the extreme right end of the dial a dead pin or post 47 so as to permit the full swee of the contact member'31 over all of the live points.

I claim: c

In a voltage regulator, 'thef'combination with the spaced dial-points'arranged" in an arc; of "a contact arm pivoted concentric to said arm, a contact member mounted 'onsaid arm foflt'ravers ofthedial points, and means connected with the said contactme'mber andriding'upon the pointsand into the spaces therebetween whereby to retract the nose of the contact member as it moves from one ointto another to prevent bridgin and permit it to advance into contact Wlilh a single point when brought into line there- 2. In a voltage regulator;-the combination with the spaced dial-points arranged -in an arc, of a contact armpivoted concentric to said arc, a contact member mounted on said arm' for traverse "of the dial' points, and means carried by the saidcontact member and riding upon the points and into the spaces therebetween whereby 'to' retracbthe nose of the contact member as'it moves from one point to another to prevent "bridging and-"perl'r'iit it'to"advance'into' contact with a single point when brought into'j line there- .VIH', 8. In a "voltage re ulates: the combination with the spaced dial-points arranged in an arc, of a contact arm pivoted concentric to said arc, a contact member mounted for reciprocation on said arm, yielding means to press the said mcmber'into contact with the dial points as the arm is swung on its ivot, a crosshead mounted on said memer, a member carried by the crosshead and arranged to ride upon the points' and into the spaces therebetween, whereby to retract the nose of the contact member as it moves from one point to another to prevent bridgin; and to permit it to advance into contact with a single point when brought into line therewith.

4. In a voltage regulator, the combination with the spaced dial-points arranged in an arc of a contact arm pivoted concentric to said arc, a contact membermounted for re ciprocation on said arm in line withthe radius of said arc, a spring to press the said member into contact with the dial points as the arm is'swung on its pivot, across head mounted on said member,' a member carried by the cross headand arranged to ride upon the pointsand into the spaces therebetween, whereby .to retract the-nose'ofnth'e contact member 'as itt movesxfr dm one point to another to prevent bridgingialnd'to permit it to advance into contact fwithia."single'tpoint when brought into line therewith. I

5. In a voltage regulatorythecombination with the spaced dial points arranged'in an arc, of a contact arm pivoted concentric to said are, a contact member mounted for reciprocation on said arm iniline with the radius of said arc, yielding means to press the said member into contact with the-dial points as the arm" is swung'on-its pivot; a cross head rigidly mounted'onsaid member.

a' pair ,pf members carried jby the cross head and arranged to ride upon the pointsand into the spaces therebetweem whereby toretract the nose of the contact member as'it moves from one point to another to prevent bridging and to permit into advance into i contact with a single point when brought into iine'the'rewith. f n 1 6. In a voltage-regulator; the. combination with the spaced dial-poihts'arranged in an arc, of a con actarm;pivotedconcentric to said are. a contact member mounted'for reciprocation on said am in' line-with the radius of said arc, a spri'ngto press the said member into contact with the dial pointsas the arm is swung on its pivot,'a cross head rigidly mounted on said membenja roller carried by the crosshead and arranged'to ride upon the points and into the spaces therebetween, whereby to retract the nose of the contact member as it moves from one point to another to prevent bridging and to permit it to advance into contact with a single point when brought into line there W1 w w 1 32w 7. In a voltage re ulator, the combination with the spaced'dia -p0ints arranged in an arc, of a contact arm pivoted concentric to said are, a contact member mounted for reciprocation on said arm in line with the radius of said are, a spring to ress the said member into contact with the ial points as the arm is swung on its pivot, a cross head ri idly mounted on said member, a pair of rfilers carried by the cross head arms one on each side of the contact member and urranged to ride upon the points and into the spaces therebetween, whereby to retract the nose of the contact member as it moves from one point to another to prevent bridging and 15 to permit it to advance into contact with a smile point when brought into line therewlt In testimony whereof I have hereunto signed my name in the presence of two subgo scribing witnesses.

JOHN D. NIES.

Witnesses:

LEWIS T. Gms'r, MARY C. Bnowmz.

copies 0! thin patent may be obtained for five cents each, by ldzlreuln: the "communion: of htentl,

wuhmgtoa, D. 0."

It is hereby certified that in Letters Patent No. 1,285,786, granted November 26, 1918, upon the application of John D. Nies, of St. Charles, Illinois, for an improvement in Contact-Arms for Voltage-Regulators, an error appears in the printed specification requiring correction as follows: Page 2, line 42, claim 1, for the word arm read arc; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the casein the Patent Ofiice.

Signed and sealed this 28th day of January, A. D., 1919.

[sEALJ R. F. \VHITEHEAD,

Acting Commissioner of Patents. 

